Damper Piston Seal Ring Structure to Prevent Reverse Movement
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Solution Overview
Problem
Existing damper devices face issues where the piston rapidly returns in the opposite direction due to pressure in the cylinder chamber, leading to inadequate air movement through the orifice.
Innovation Solution
A damper device design featuring a piston with a column portion, first and second restricting portions, and a seal ring that deforms to enter a cutout portion, preventing reverse piston movement by maintaining seal contact with the cylinder's inner surface and allowing air to flow through, thus preventing excessive negative pressure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the piston rapidly moves in the cylinder, then the damping force is generated, but the piston may return in the opposite direction due to pressure in the cylinder chamber
Solution Approach 1:
The seal ring is designed to be deformable and capable of changing its sealing state dynamically. During rapid piston movement, the seal ring deforms to enter the cutout portion, releasing the seal and allowing air to pass through, which prevents the piston from returning due to pressure buildup. This dynamic sealing mechanism adapts to different movement conditions.
Solution Approach 2:
The seal ring's physical state is changed from a fixed sealing state to a deformed non-sealing state during rapid movement. By allowing the seal ring to deform and enter the cutout portion, the sealing parameter is temporarily changed, enabling air flow through the piston area and preventing excessive negative pressure that would cause piston reversal.
2Reliability
If the seal ring maintains continuous seal contact with the cylinder, then sealing is improved, but air movement through the orifice is restricted during rapid piston movement
Solution Approach 1:
The seal ring transitions between two states: a normal sealing state where it contacts the cylinder inner periphery, and a deformed non-sealing state where it enters the cutout portion. This dynamic transition allows the system to maintain sealing during normal operation while enabling rapid air flow during fast piston movement.
Solution Approach 2:
The seal ring is temporarily extracted from its sealing position by deforming it into the cutout portion during rapid movement. This extraction removes the seal ring from the sealing interface, allowing air to move freely through the area where the seal ring would normally block flow, thus enabling rapid pressure equalization.
3Reliability
If the seal ring is made rigid to maintain seal contact, then sealing reliability is improved, but the seal ring cannot deform to enter the cutout portion during rapid movement
Solution Approach 1:
The seal ring's material properties are selected to provide appropriate flexibility. The seal ring is made of a material that maintains sufficient rigidity to seal against the cylinder inner periphery under normal conditions, but is flexible enough to deform and enter the cutout portion when rapid piston movement occurs, thus adapting to different operational requirements.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The design effectively prevents piston reversal during rapid movement by managing pressure and airflow, ensuring smooth operation and immediate damping force restoration.
Implementation Method 1
The seal ring is capable of taking a deformed state where the seal ring is deformed so as to partially enter the cutout portion by movement of the piston
Implementation Method 2
the seal ring is pressed against an inner peripheral surface of the cylinder by the protruding portion
Data Source
AI summary
There is provided a damper device including: a cylinder; a piston; and a seal ring. The piston includes: a column portion wound around the seal ring; and a first restricting portion and a second restricting portion that are configured to restrict movement of the seal ring in a axial direction. The column portion has a protruding portion protruding outward in a radial direction. The first restricting portion has a cutout portion. The seal ring is capable of taking a deformed state where the seal ring is deformed so as to partially enter the cutout portion by movement of the piston. In a case where the seal ring is in the deformed state, and in a normal state where the seal ring does not enter the cutout portion, the seal ring is pressed against an inner peripheral surface of the cylinder by the protruding portion.